DigiTech's Mosaic Polyphonic 12-String Effect Pedal enables you to create lush and chimey 12-string sounds using a 6-string electric or amplified acoustic guitar. By using advanced polyphonic pitch shifting and "intelligent" doubling algorithms, the Mosaic approximates the sound of a 12-string, duplicating a monophonic and/or polyphonic input signal an octave below, down to 20 Hz, and doubling high frequencies up to 1 kHz.